JP2555010Y2 - Support structure for throttle valve rotation shaft - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION The present invention relates to an engine intake which branches into a primary intake passage which is always conducting regardless of the engine load and a secondary intake passage having a shut-off valve which is opened only at a high load. The throttle valve rotating shaft disposed in the engine intake passage including the shut-off valve disposed in the secondary intake passage of each branch pipe portion of the manifold is generated by the vibration of the engine and the pulsating intake flow in the intake passage. The present invention relates to a support structure for the rotation shaft of the throttle valve, in which vibration is reduced.

[0002]

2. Description of the Related Art A rotary shaft of a throttle valve disposed in an intake passage of an engine including a shut-off valve disposed in a secondary intake passage vibrates due to engine vibration or pulsating intake air flow in the intake passage. There is a problem that the impact between the outer peripheral surface of the shaft and neck of the dynamic shaft and the inner peripheral surface of the bearing generates a tapping sound, which impairs the durability of the outer peripheral surface of the shaft and neck and the inner peripheral surface of the bearing. A configuration in which a plurality of cylindrical elastic members having a petal-shaped cross section are disposed between a ring member rotatably and loosely fitted on a shaft neck and a bearing inner peripheral surface is disclosed by Japanese Utility Model Application Laid-Open No. 63-121814. Japanese Patent Application Laid-Open No. 1-114924 discloses a configuration in which a rotating shaft is curved and an outer peripheral surface of a shaft neck portion of the rotating shaft is pressed against an inner peripheral surface of a bearing by the elastic force of the rotating shaft. . However, the configuration disclosed in Japanese Utility Model Laid-Open No. 63-121814 is complicated, and the configuration disclosed in Japanese Utility Model Application Laid-Open No. 1-114924 has a problem that it is difficult to give a predetermined bending to the rotating shaft.

[0003]

SUMMARY OF THE INVENTION A throttle valve rotating shaft which can urge the throttle valve rotating shaft in a radial direction of the rotating shaft by a spring having a simple shape to reduce vibration of the rotating shaft. It is an object of the present invention to obtain a supporting structure of the present invention.

[0004]

The rotating shaft is urged in the radial direction of the rotating shaft by the following structure. That is, in a housing forming an intake passage of the engine, an annular leaf spring having one end bent in a mountain shape inwardly is disposed concentrically with a rotation axis of a throttle valve arranged in the intake passage, A configuration in which a bent mountain-shaped top is elastically brought into contact with the rotating shaft, and the rotating shaft is biased in a radial direction of the rotating shaft.

[0005]

FIG. 1 is a cross-sectional view of an embodiment of a support structure for a rotary shaft of a throttle valve according to the present invention, cut along a plane passing through the center line of the rotary shaft of the throttle valve. Intake passage 1
, A throttle valve, 4 is a throttle valve rotating shaft, 5 is a ring-shaped leaf spring arranged in the housing 2 concentrically with the throttle valve rotating shaft 4, 6 is a bearing, 7 is a sealing member for preventing dust from entering the intake passage 1 together with air;
Is a disk for preventing the annular leaf spring 5 from falling off. The disk 8 is provided with a screw member 11 via a packing 9 and a flanged ring member 10.
Is fixed to the end surface of the rotating shaft 4.

FIG. 2 is a sectional view taken along the line AA of FIG. 1. As shown in FIG. 1, 2 is a housing, 4 is a rotating shaft, 5 is an annular leaf spring, and 11 is a screw member. One end 5 of annular leaf spring 5
-1 is bent in a mountain shape inward, and the top of the bent mountain shape elastically contacts the outer peripheral surface of the rotation shaft 4 to urge the rotation shaft 4 in the direction indicated by the arrow 12. The other end 5 of the annular leaf spring 5
2 is bent outward in the radial direction and inserted into a groove 2-1 formed in the housing 2, and a direction 12 for urging the rotating shaft 4 is determined by selecting a position of the groove 2-1.

FIGS. 3 and 4 show a plurality of shutoff valves 1 arranged in a secondary intake passage 13 of each branch pipe of an intake manifold of an engine.
An embodiment in which the support structure of the throttle valve rotation shaft of the present invention is applied to the rotation shaft 4 that rotates integrally with the rotation shaft 4 (claim 2). The rotating shaft 4 is connected to an actuator 15 according to the operating state of the engine.
To rotate. FIG. 3 shows that the annular leaf spring 5 is attached to the end of the rotating shaft 4 on the side opposite to the side connected to the actuator 15. A case is shown in which an annular leaf spring is not provided in order to expect a suppression effect (claim 3).

Depending on the vibration of the engine or the state of the pulsating intake air flow in the intake passage 13, not only one end of the rotary shaft 4 but also between the shutoff valves 14 adjacent to each other and the end where the actuator 15 is connected. An annular leaf spring 5 at any one of a plurality of locations
FIG. 4 shows a case where an annular leaf spring 5 is also disposed at one position between the shut-off valves 14 (claim 4).

When the annular leaf springs 5 are arranged at a plurality of positions on the rotating shaft 4 having a plurality of shut-off valves 14, and when the vibration direction of the engine is complicated, each annular leaf spring 5 is 4
May need to be set to various directions in a plane perpendicular to the rotating shaft 4. FIG. 5 is a cross-sectional view showing an example of an attached state of the annular leaf springs 5 disposed between both ends of the rotary shaft 4 and each of the shut-off valves 14 at an arrangement position of each annular leaf spring 5. The reference numerals in the drawing indicate the same parts as those in FIG. 2, and the required biasing direction 12 is provided by selecting the direction of the end 5-2 of the annular leaf spring 5 bent outward. (Claim 5).

FIGS. 6 and 7 show a case where the throttle valve 3 including the shut-off valve 14 can suppress the vibration of the rotary shaft 4 only in the vicinity of the fully closed position affected by the pulsating intake air flow in the intake passage. As shown, the outer peripheral surface of the rotating shaft 4 with which the bent mountain-shaped top of the annular leaf spring 5 abuts is formed on the cam surface, and the annular leaf spring only including the shut-off valve 14 when the throttle valve 3 has a small opening degree. If the configuration is such that the top of the angled bent portion 5-1 of FIG. 5 abuts and urges the rotating shaft 4, the rotating shaft 4 is quickly rotated following the operation state, and It is possible to reduce abrasion between the shaft neck portion of the rotating shaft 4 and the bearing due to the urging, and to improve the durability of the annular leaf spring. 6 and 7, since it is difficult to form a cam surface directly on the outer peripheral surface of the rotating shaft 4, a cylindrical member that rotates integrally with the rotating shaft 4 is disposed on the rotating shaft 4. An example is shown in which a cam surface is formed on the outer peripheral surface of the cylindrical member. 6 is a cross-sectional view cut along a plane including the center line of the rotating shaft 4, and FIG. 7 is a cross-sectional view taken along the line BB of FIG.
4) is a throttle valve (shutoff valve), 4 is a rotating shaft, and 5 is an annular leaf spring, as in FIGS.
6 is a cylindrical member that rotates integrally with the rotating shaft 4, and is engaged so as to rotate integrally with a flat portion 17 formed at a fitting portion between the rotating shaft 4 and the cylindrical member 16. A cam surface 18 is formed on the outer periphery of the cylindrical member 16. 6 and 7 show the throttle valve 3.
(Shutoff valve 14) indicates a small opening degree near full closure, and the outer peripheral surface of the cylindrical member 16 in which the top of the angled bent portion 5-1 of the annular leaf spring 5 rotates integrally with the rotation shaft 4. When the throttle valve 3 (the shut-off valve 14) is opened and the rotary shaft 4, that is, the cylindrical member 16 is rotated in the direction of the arrow 19, the throttle valve 3 (the shut-off valve 14) is rotated to the top position of the mountain-shaped bent portion 5-1 of the annular leaf spring 5. The cam surface 18 comes and the urging of the rotating shaft 4 is released (claim 6).

[0011]

According to the present invention, the secondary intake passage of each branch pipe can be shut off in any direction as required by a simple-shaped spring having an annular leaf spring having a mountain-shaped bent portion whose one end faces inward. By biasing the rotation axis of the throttle valve in the intake passage of the engine including the valve, the vibration of the rotation axis can be effectively suppressed.

A cam surface is provided on the outer peripheral surface of the rotary shaft itself which comes into contact with the top of the angled bent portion of the annular leaf spring, or on the outer peripheral surface of a cylindrical member which is disposed on the rotary shaft and rotates integrally with the rotary shaft. Is formed, the rotary shaft can be urged in the radial direction only when the throttle valve including the shut-off valve is at a small opening near the fully closed position.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of an embodiment of the present invention cut along a plane passing through a center line of a throttle valve rotation shaft.

FIG. 2 is a sectional view taken along the line AA of FIG. 1;

FIG. 3 is a view in which the present invention is applied to one end of a rotation shaft of a shutoff valve arranged in a secondary intake passage of each branch pipe of an engine intake manifold.

FIG. 4 is a diagram in which the present invention is applied to a plurality of locations on a rotation shaft of a shutoff valve arranged in a secondary intake passage of each branch pipe of an intake manifold of an engine.

FIG. 5 is a view showing an example of the arrangement of an annular leaf spring when the present invention is applied to a plurality of portions of a rotating shaft and the rotating shaft is urged in different directions.

FIG. 6 is a cross-sectional view of the embodiment of the present invention in which a contact surface with an annular leaf spring is formed with a cam surface, taken along a plane passing through the center line of the rotating shaft.

FIG. 7 is a sectional view taken along the line BB in FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Intake passage of engine 2 Housing 3 Throttle valve 4 Rotating shaft 5 Annular plate spring 5-1 Inwardly bent portion 5-2 Outwardly bent portion 6 Bearing 7 Seal member 12 Arrow indicating the biasing direction 13 Secondary intake passage in intake manifold 14 Shut-off valve 15 Actuator 16 Cylindrical member that rotates integrally with rotation shaft 17 Engagement flat portion 18 Cam surface

Claims (6)

(57) [Scope of request for utility model registration] An end portion of a housing (2) forming an intake passage (1) of an engine is provided concentrically with a rotation shaft (4) of a throttle valve (3) disposed in the intake passage (1). An annular leaf spring (5) bent inwardly toward the inside is disposed, and the top of the bent mountain is elastically brought into contact with the rotating shaft (4) to rotate the rotating shaft (4). Is supported in the radial direction of the rotary shaft (4). 2. A secondary intake passage (13) having a primary intake passage in which the throttle valve (3) is always in conduction irrespective of the engine load and a shutoff valve (14) that opens only when the load is high.
And a shutoff valve (1) disposed in the secondary intake passage (13) of each branch pipe portion of the intake manifold of the engine.
4. The support structure for a throttle valve rotation shaft according to claim 1, wherein 3. An actuator (4) for controlling a rotating shaft (4) of a rotating shaft (4) to which a plurality of shut-off valves (14) arranged in the secondary intake passage (13) are attached. 15) The support structure of the throttle valve rotating shaft according to claim 2, wherein the end opposite to the mounting side is biased in the radial direction of the rotating shaft by a bent mountain-shaped top of the annular leaf spring. . 4. A rotary shaft (4) to which a plurality of shut-off valves (14) arranged in the secondary intake passage (13) is attached, between the plurality of shut-off valves (14) or the rotary shaft (4). 3. The rotating shaft (4) is urged in a radial direction of the rotating shaft (4) at a plurality of any ones of both ends of the rotating shaft (4) by a bent mountain-shaped top of the annular leaf spring (5). Support structure of the throttle valve rotating shaft. 5. The support structure of a throttle valve rotating shaft according to claim 4, wherein said annular leaf springs (5) arranged at said plurality of positions have different biasing directions of a rotating shaft (4). . 6. A rotary shaft (4) portion with which the bent mountain-shaped top of the annular leaf spring (5) abuts, or an outer peripheral surface of a cylindrical member (16) that rotates integrally with the rotary shaft. Cam surface (18)
Only when the throttle valve (3) including the shut-off valve (14) is at a small opening degree near the fully closed position, the rotating shaft (4) moves in the radial direction of the rotating shaft (4). 6. The support structure for a throttle valve rotating shaft according to claim 1, wherein the spring is biased by a spring.